530 



R. W. Hegner 



surface view. The surface at the inner end is creased and folded 

 just as was found to be the case with younger eggs (C.B. 4, e). 

 Longitudinal sections through this egg present a distribution of 

 material similar to that with which we are already familiar. A 

 gray cap is present at the outer end (Fig. 19, g^ c)', the largest 

 deutoplasmic spheres are adjacent to the gray cap, and there is a 

 gradual decrease in the size of the yolk-globules until near the 

 inner end where these are lacking altogether giving way to the 

 vesicular zone. Most of the vittellophags have passed into the 



vt.a. 



Fig. 19 Longitudinal section through egg C.B. 5, h., showing the effects of a centrifugal force 

 applied for two hours upon an egg covered by a blastoderm. Explanation of letters same as Figs. 

 15-18. vtM, = vitellophags which have fused with the blastoderm. 



inner half of the egg; a number of them seem to have fused with 

 the "Keimhautblastem" in the equatorial region. As was the 

 case with the "Keimhautblastem" in the younger eggs (C.B. 4, e) 

 the superficial layer (blastoderm) has become thinner at the outer 

 heavy end until it is barely visible at certain points; its mass has 

 been added to that toward the inner end. The primordial germ- 

 cells occupy their normal position at the posterior end of the egg. 

 C.B. 5, c. An egg in the condition just described was allowed 



